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N. PETERS. FHOTGLITHOGRAPHER, WASHINGYON. D, C,

tuted tapes ralieni dimite.

JOHN H. STONE, OE PHILADELPHIA, PENNSYLVANIA.

Letters Patent No. 99,725, dated Februoary 8, 1870.

IMPRovEn WATER-COOLER.

The Schedule referred to in these Letters Patent and making part of the same.

MPL- aaccompanying drawings and'toA the letters of reference marked thereon.

The water-coolers in common use are each provided with an lielineticallysealed air space between the interior, or ice-vessel, and the exterior, or enclosing-case, for the purpose of prevent-ing the otherwise rapid transmission ot' heat from the surrounding atmosphere to the contents of the said interior vessel; and this result is attained, ina greater or lesser degree, in 'proportion to the thickness of the enclosedstratum ot' air and the perfection of the sealing; but, nevertheless, the stratum of confined air, being in direct contact with the inner side of the exterior case, the contact suriace of the said stratum necessarily, and in a very few moments, attains to nearly the same temperature, becomes lighter,- rises, and gives place to cooler portions ot' the contined air, and so on, the warmed portions of the stratum constantly intel-mingling withy the cooler portions, the temperature ofthe whole st-ratmn eventnally becomes equal with that oi`- the external atmos-V phere, the ice in theinterior vessel at the same time gradually yielding to the `predomina-ting temperature of the said atmosphere. Besides, when the exterior easing is madel ot'sheet-metal, as is generally the fact in: water-coolers, the comparativelycool condition of tillic stratum ot' conlined air around and in direct contactwith the ice-vessel is rapidly imparted to the thin metal ot' the said exterior case, and, conseqnently, the moisture in the comparatively warm atmosphere is rapidly condensed upon and runs down the outside surface of the vessel in a very copious, and therefore objectionable, degree.

The .object ot' my improvement is to remedy these objectionable results in water coolers, by retarding, in a more effectual manner, the transmission of heat and cold between the exterior andthe interior of the saine; and

My invention consists in the employment of a stratum ot' felt, thick paper, or their equivalent, poor conductors of heat, in direct contact with either the interior surface of the exterior case or the exterior surface ot' the interior vessel, in combination with the usual strat-unl ot' confined air between the saitlcase and the said interior vessel, substantially as hereinafter set forth anddescribed.

. ,Referrinv to the drawinff" which re resents a vertical central section ot an improved water-cooler- A B is the exterior' case; G D, the interior vessel; E, the usual air-space; and l l `,'the stratum of ,felt or thick paper between the i air-space and the exterior case.

The exterior case, A B, and the interior vessel, CV

D, are made ot' sheet-metal, and connected together at their upper ends with the hermetically-sealed air space E,`between them, in the. usual manner; but, before the said spafce E is closed, the stratum ot'felt or paper F is inserted, so that it will t lirmly in close contact with the whole inner surface ofthe case A 1B.

1n like-manuel', the. bottom and the lid or cover of the vessel are each tittetl with a stratum ot'felt or paper, F, substantially as represented in the drawing.

Felt and paper being each very poor conductors of heat or cold, and the stratum ot' either being in close contact with the sheet-metal which hounds one side of the air space E, the transmissionl ot' heat from the surroumling atmosphere to the air-space will be greatly retarded; and for the same reason, the transmission of cold ti'om the same stratumot' confined air to the exterior sheet-metal Ycasing A B,will be retarded, and the condensation of the moisture in ,the 'atmosphere proportionately diminished, and, "in n'tost cases, entirely prevented.A y

When the exterior case is made of wood, the condensa-tion of moisture does not occur abut the advantage arising trom the employment ofthe felt or paper, in retardingr the transmission ot' heat from the surroundipg atm'osphere to the air-space is of very great importance iii the economizing ofthe ice in the containing vessel.

Having thus fully described my improvement,

What I claim as new therein, of my invention, and desire to secure by Letters Patent, is confined to the following- A sheet-metal water-cooler, having a. stratum, F, of felt, paper, or othcrlike porous materiahin direct contact with the inner side surfaces ofthe exterior vessel, and leaving the space E, tbl-"confined air, between the said stratum F and the exterior surface ot' the inner "essel .D C, as and for the purpose hereinhetore set forth.

J. H.` STONE.

Witnesses:

Bem. MoRIsoN, WM. H. MomsoN. 

